through school to become a civil engineer. seven years of dating passed before he ever popped the question. well, that s the kicker. she got angry. she got up and walked away. reporter: why? without even saying yes. and i m just like, oh, dear god. i ve made a gigantic mistake. reporter: oh, no. i ve moved too fast. and she gets over there and she goes to her purse, and she brings out this box. and it s, you know, a long box. and she hands it to me. she go, i thought you d try this one of these days. oh, dear god, what is it? is it a big no or what on a piece of paper, whatever? reporter: on the contrary. inside was a bracelet etched with the letters y-e-s. yes. they were married almost a year later. after their wedding, they honeymooned in ireland. how do you like the beer here? beer is absolutely wonderful. much better than america. reporter: there was kim, ever fearless, trying her hand
investigators, it was possible derrick dorsey had tried, literally, to cover up evidence. everything they were hearing led them to wonder, had he killed his wife? by then, the line of questioning seemed to weigh on derrick. i m not stupid. you re asking me certain questions in certain ways. right. and that means you re thinking certain things. did someone harm her? is that what it s looking like? looks like that. did you worry that they might think it was you? i don t doubt they did think it was me. but i knew that, if they originally thought it, it would come to light that there s just obviously no way i could have done it. reporter: even as he sat in that interview room, detectives outside it were, in fact, checking out his fire station alibi. did derrick dorsey s alibi check out? was he really at work? yes, he was. he had spent the whole day at work. there were some phone calls that he had made to kim that were went unanswered, but that wasn t unusual. reporter
large warning signs is on it. weight gain, restless sleep, things like that. reporter: kim feared that stopping the medication too suddenly could make her more depressed. he said she was making plans that last week of october 2012 to see her doctor. in the meantime, it so happened that a storm, a brutal one called hurricane sandy, had been heading north off the atlantic coast. how well did she know the anatomy of a hurricane and what it was capable of? very well. being a civil engineer, she knows what structure can do and what they can t do. with her teaching and so forth and training of the inspectors she knew what had to be done to a house in order to protect the inhabitants. reporter: she makes everyone safe. absolutely. reporter: eventually, the superstorm tracked east, giving most of florida a pass before barreling north and into the history books. kim didn t seem to have either the weather or personal troubles on her mind as the weekend rolled around.
yes. what kind of gun? pink taurus,.38. semi automatic? a revolver. revolver. where is it normally kept? in her drawer that was open. to the left of the bed. did you open that drawer? i don t think so. you don t think so. did you look in the drawer? absolutely. i thought she shot herself. reporter: he explained kim had been battling depression, then battling side-effects from the medicine. he said their marriage had suffered. when is the last time that you and kim had sex? a while back. a while back? when you say a while back like weeks. reporter: derrick dorsey had something else to reveal. were either one of you stepping out, you know, girlfriend on your behalf or boyfriend on hers? i do. okay, you got a girlfriend. i said, what about a girlfriend? you got a girlfriend? and he readily said, there s a lot going on here. reporter: derrick had just admitted that he d been unfaithful to kim. obviously, big, big red flags. reporter: assistan
and we re thinking, well, could these be defensive wounds, from when she was hitting him if he was the killer? they asked about those scratches. j.r. said he got them on the job handling wires and plastics. he also worked with zip ties? yes. what are you thinking then about the sound man? can you cross him off your list? we think he s a possibility. more than a possibility, thought the prosecutor. he had scratches. he had injuries to his hand, which, you know, from kim s body, we knew that she fought for her life. she was engaged in a tremendous struggle. so he said that was just something he got, you know, during the course of his job. but obviously, as an investigator, you re seeing the other side of that. is he just making an excuse? so there are some things they re seeing that could potentially be tying him to this crime. absolutely. they just need to find out more. yes. the detectives asked j.r. where he d been the previous